If you setup your bash scripts for installing dependencies, you can easily dispose of instances if they get into a bad state. Your fresh machine will come configured, so you can freely reboot when you encounter problems.
Note: Rebooting your instance will save uncommitted files, so you can freely use brev reset when experimenting with the setup script
Reboot your instance
From the CLI
brev reset <instance-name-or-id>
From the console
Click on an instance to go to its settings, switch to the 'Software' tab, and click the 'Reboot This Instance' button.